LM2575-3.3WU Equivalent & Substitute Parts

Part Overview

The LM2575-3.3WU is a buck switching regulator IC manufactured by Microchip Technology, delivering a fixed 3.3V output at 1A. This surface-mount component operates across an input voltage range of 4V to 40V with a switching frequency of 52kHz. The device is actively produced and RoHS3 compliant, making it suitable for cost-sensitive applications requiring step-down voltage regulation in compact form factors.

Substitute parts become necessary when the original part is unavailable, when higher output current capacity is required, or when extended input voltage range specifications are needed for specific application requirements.

Key Parameters

Parameter	LM2575-3.3WU
Manufacturer	Microchip Technology
Function	Step-Down Buck Regulator
Output Voltage (Fixed)	3.3V
Output Current	1A
Input Voltage Range	4V to 40V
Switching Frequency	52kHz
Package	TO-263-6 (D2PAK, 5 Leads + Tab)
Operating Temperature	-40°C to 125°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Fixed Output Voltage: All substitute parts maintain the 3.3V fixed output specification, ensuring direct functional compatibility.

Package Compatibility: All substitute parts use the TO-263-6 (D2PAK) package with 5 leads plus tab, maintaining identical PCB footprint and thermal characteristics.

Operating Temperature Range: All parts operate across -40°C to 125°C (TJ), meeting the same thermal specifications.

Compliance Standards: All parts are RoHS3 compliant and REACH unaffected, matching regulatory requirements.

Topology and Configuration: All parts are buck switching regulators with positive fixed output and single output configuration.

Substitutes are grouped by output current capacity and input voltage range specifications, which determine suitability for specific application requirements while maintaining electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min)	Input Voltage (Max)	Switching Frequency	Package	Product Status
LM2575-3.3WU	Microchip Technology	1A	4V	40V	52kHz	TO-263-6	Active
TL2575-33IKTTR	Texas Instruments	1A	4.75V	40V	52kHz	TO-263-6	Active
TL2575HV-33IKTTR	Texas Instruments	1A	4.75V	60V	52kHz	TO-263-6	Active
LM2592HVS-3.3/NOPB	Texas Instruments	2A	4.5V	60V	150kHz	TO-263-6	Active
LM2592HVSX-3.3/NOPB	Texas Instruments	2A	4.5V	60V	150kHz	TO-263-6	Active
LM2596S-3.3/NOPB	Texas Instruments	3A	4.5V	40V	150kHz	TO-263-6	Active
LM2596SX-3.3/NOPB	Texas Instruments	3A	4.5V	40V	150kHz	TO-263-6	Active

Engineering Selection Recommendations

All listed substitute parts are actively produced and RoHS3 compliant, meeting current regulatory requirements. Selection between substitutes depends on application-specific requirements:

1A Output Current Requirement: TL2575-33IKTTR and TL2575HV-33IKTTR maintain the 1A output specification of the original part. TL2575-33IKTTR operates to 40V maximum input, while TL2575HV-33IKTTR extends to 60V maximum input.

2A Output Current Requirement: LM2592HVS-3.3/NOPB and LM2592HVSX-3.3/NOPB provide doubled output current capacity with extended input voltage range to 60V and higher switching frequency at 150kHz.

3A Output Current Requirement: LM2596S-3.3/NOPB and LM2596SX-3.3/NOPB provide tripled output current capacity with input voltage range to 40V and 150kHz switching frequency.

All parts maintain identical package geometry, thermal characteristics, and operating temperature range, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can TL2575-33IKTTR directly replace LM2575-3.3WU?

A: Yes. Both parts deliver 1A at 3.3V fixed output in the TO-263-6 package with identical operating temperature range and RoHS3 compliance. The minimum input voltage specification differs (4.75V vs. 4V), which is acceptable in applications where input voltage remains above 4.75V.

Q: What is the difference between LM2592HVS-3.3/NOPB and LM2592HVSX-3.3/NOPB?

A: Both parts are electrically identical with 2A output current, 3.3V fixed output, and TO-263-6 package. The difference is packaging format: LM2592HVS-3.3/NOPB is supplied in tube packaging, while LM2592HVSX-3.3/NOPB is supplied in cut tape and digi-reel format.

Q: Can I use LM2596S-3.3/NOPB as a drop-in replacement for LM2575-3.3WU?

A: Yes, from a package and electrical output perspective. LM2596S-3.3/NOPB provides 3A output current in the same TO-263-6 package with identical 3.3V fixed output and operating temperature range. The higher current capacity and 150kHz switching frequency are backward compatible with applications designed for 1A operation.

Q: What is the maximum input voltage difference between substitutes?

A: TL2575HV-33IKTTR and LM2592HVS-3.3/NOPB extend maximum input voltage to 60V, compared to 40V for the original LM2575-3.3WU and LM2596S-3.3/NOPB. Selection depends on application input voltage specifications.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of the original LM2575-3.3WU.

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